This Creature Has 10 Eyes, Blood That Saves Your Life
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Horseshoe crabs are bizarre creatures that have survived four mass extinctions, including that wiped out dinosaurs
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Called "living fossils", Horseshoe crabs have 10 eyes and walk on as many legs
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Their eyes can also detect ultraviolet light from the Moon and stars
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They are not actually crabs, but are distantly related to spiders and scorpions
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Their blood has specialised immune cells called amebocytes, and has saved countless human lives
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Extracts from their cells have been used to test contamination in vaccines, surgical tools and medical devices
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They have saved people from dying of infections like pneumonia and E coli
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Of the four species that survive today, one is found in Atlantic coastal waters and other three live in the Pacific
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The largest population of Horseshoe crabs is found in Delaware Bay
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